Subdomains can have an impact on SEO, but it depends on how they are used. In general, subdomains can be treated as separate entities by search engines, meaning that the content on a subdomain may not receive the same SEO benefits as content on the main domain.
However, if the content on the subdomain is relevant to the main domain and supports the overall goals of the website, then it can be helpful for SEO. For example, if you have a subdomain for a blog that is related to the main website's content, then it can potentially drive traffic to the main site and improve its overall search visibility.
It's important to note that subdomains should not be used as a way to artificially inflate the number of pages on a site, as this can be seen as manipulative by search engines and negatively impact your site's ranking.
In summary, subdomains can be helpful for SEO if they are used in a strategic and relevant manner, but they should not be used to artificially manipulate search results.
